is necessary that you start training a f...

is necessary that you start training a few months before the walk.

A. This B. That

C. What D. It

D 【解析】试题分析：句意为：在走路之前你开始练习几个月是有必要的。这是一个主语从句，用形式主语it 代替真正的主语that you start training a few months before the walk.，以避免头重脚轻。故选D。考点：考查it的用法。

考点分析：

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